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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66393b1e2b4c1919e5c54f14891be9c792832d24cf7a8381f2a4d357f1a37fb0' 
  AND token = 'juDwtTGfJMTCDxU7pWRoWG9VUuq4q3eOQP6d50aI+1s=' 
  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"
    }
  }
}