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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed81985be4c12c57e457375257fbab5fa53b90e3041e6e70ca10db283dd68ac0' 
  AND token = 'T3lih4bABDmNGvBgvnTpZhqWl62Ox4uQSYIeSQWZZsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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