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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd5577b3ebfd9e62c50a2dbd7a6f42b693bd8c029a8c96924d69366f6ed1b22' 
  AND token = 'e2+V3yjsInrcEgdK6l4KWXwwzjuot2pwzlGCNXLftMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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