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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13cac57f377677b33cb50dc4f205dee4c9567bba98b99d7badbdeb224252c2f' 
  AND token = 'byo8hwbdJvf+VWjk9eh6M7GaXss5MxDkS6Q1ux8S3L8=' 
  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"
    }
  }
}