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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cf56b85d47713074c378b77ffdd5e8b63e6c597d88b73bd8e4d25d9ce50428' 
  AND token = 'gKGzcE/4NAa4/75WTJiDSLoMIQH9jUmZIh8KrkK4d0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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