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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2394f44f3181a173006b0aa7157f3d21b599441c7c7327c76fb005dc6c5527' 
  AND token = '2OYJSuGP9EfhEd2/D5kF0w6GfbXpeAw6h59y9HV8sT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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