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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daa9ea8cc692da3a3d8d2e8939c6d2a38c206cb75418fc684942d54feae2097' 
  AND token = 'cRo3K3htt+fhFW2cB7dUVanmctgN6scqzXiIzwwU0lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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