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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf7420ed43eeac95fe1b7acef8870ceb2e8dd727abee17e51670c115206f810' 
  AND token = 'AeQpnh0CtBP+KIZVdeQd6/uDNHVYV8VVqEh8CpdTg0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}