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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aeb9a7ab75a3edcecb4441b324af812d850632b21b5eb2047c93ad5f03d7e54' 
  AND token = 'SzASECxyyhboU2kQ1RhuBOdut7zgN5Yvu0/oSDKAxj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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