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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81eafa6ac112b894320d278a4818d73d30d6050de7a494ddcce4fc76343fde7' 
  AND token = 'qnJmp1dRJvUDZh8XGTPHpLJN4bF/ZUXJXVx8raVb9iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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