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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a13a4a40a486d7405cde0a3604a28a54a06ac3fad4874287d8af93da873e59e' 
  AND token = '6gRQElknjsB1LEGfyEYfBgm8pw3JlqmkvFrIQ8sBYu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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