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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7b2308b719c3add2321229f9c6c0ec8aebc6e6b0572834a3db2e9b0e7ac2b1' 
  AND token = 'Bx7Yj8xzD1iRU1cWryYzbseMIoPCOv17BMF08BVDrCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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