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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49b1dfc90c3b1b7a4382bcefd2bcb13fd0f568a40a886f5224b1ba31de036d57' 
  AND token = 'v4tKKy8bbXq7XitOeBDrUAIZciqpZ7FtN9tHZimUv4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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