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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0394c9ea16453b62ec3ae49419a9540e593303518d007b90f336364aa8f933' 
  AND token = 'qPAP/c1c90+YI0hOghhkBW6uFf3nUbG/2JPocztESAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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