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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336304afbe430e6d40a3cbbdcd83963086d526ee437febd82f1c554118c001b4' 
  AND token = 'dFvkqUyh1iYe17mLy73Abkr7rsLn8s2fa+OnbT8pH/M=' 
  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"
    }
  }
}