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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e273ec9e0b3e6d11a9d9f5eecc60e6f50d7d70e0184071456d847c422171b9a' 
  AND token = 'B+cS0N3yVHolz7EhJL3ppDh/XQHrugXXNv7hlgy0o5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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