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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57660d9998c821dd71446ba70d054a8bf675c62c4187e1ab9b99e977c9b64fc' 
  AND token = 'V+4uHn5LaWXWRAwelDcOKR2BaP/m1wIfRGwM9d3PEpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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