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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795466b6dc12d1f22ff5b6f13e27e904e1980b81ce52ef0ac4526b628a60ddbf' 
  AND token = 'sA8DJdVsj0ear8Wz1IT9yss7kp5Ue8R5/a80Qj9ajN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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