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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0077529ffc0ab1e6167112530d6f25903485d757e6993252e8d1a9f9197179b' 
  AND token = '4kVoTfG3Pzql5i1sHIS+sGahNAiqv3dBld/36vzJR/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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