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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef7cb2fe9932c0b8fb304d9e97e7af69ca9565d79b36f19f0ad5a49cffc0922' 
  AND token = 'bq7Hqt0QF/9zvaCmQQNDKepua/I0zPVjoW8Zgs5/MB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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