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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49fd12313a328603ac1b40e9b0e35eaf89aa281d80de6e487ee33e42476f5a24' 
  AND token = 'd4APPAQgPOfzNKVp1gmZZhOfDcHFYKXHfaqb9n88Dbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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