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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d23740d24be90ce8f45793c67b3579fb04f76ea6105d5d8b8d52c6dc349f400' 
  AND token = 'aCgmDn+pMOm/dbCrrRV48ZF4eu3rsJ9R+VVpURs91eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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