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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c26a47849a1963376314bf01ac4050e25a11c2b0f94545aaf08656740a5e32' 
  AND token = 'B5A90d/43OlnanNE9w6OiSNnFxGYvSt5ioHYY03kzUU=' 
  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"
    }
  }
}