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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4491b35402ee3c740bbdc0cc82a3547a4ac0fdb9eee5aa46a3d30b88e3f74c7e' 
  AND token = 'Q+WTWWYFbacIp1WAa5PdzJe/gw3Bj8ZJA1STrBG8/Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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