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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb7b8bdc296e9ecc7035ff6f9cef73ae92727b21e12f3dc963584b16c531146' 
  AND token = 'bzC1FWI/0Fx0f3XIzSmR1c3G72vezdE8VedG5w5kQ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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