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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885c690d529ddc5a99ece596ed0d32073505e6e7c35c3de70f4aff178a961823' 
  AND token = 'AE0327dY92d/XD1d1IEOnMJlgDyrS4Myji8kBBQUqpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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