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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4447a85c208d09cb273bd945a38bebe14cf589836b2a12cae00035ef7db2885a' 
  AND token = 'jh0CssuFHdvM9FGtaG+cndCP8N2oWQc8Sq4GjFZGwPg=' 
  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"
    }
  }
}