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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e06d574093a5a159d4eb8d6b4ea00d1f1c56b532bdfa4b758916dc96d5d618b' 
  AND token = 'Byw2oXgL9tlMeEvtENhv5v4xCBQGOJFVVQ9TO7jxbMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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