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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916f8a2c619884cfa169aa98fccda8d41231798e2890e6821260ee431acb4c1a' 
  AND token = '3cfHcPLsqMSSKekdjWr8AVI5koh8smeoJYwHIOXodVY=' 
  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"
    }
  }
}