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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e98d815d911c6a67e4862ff98e0064a9f3d2e7f051c930798c1183db2fe92e' 
  AND token = 'NJKfdi2cq2D+Y8nyHuQT5Qdwm2Dto9uBsfRVCfpfpOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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