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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a520e3675b00b71bd1f82fcd9b89320f6c205c36eaed90242ec73335303ba74' 
  AND token = 'jw3gZuIjouCEz0j5hjd3MLTop4hRaP2dgoCDEc9NO5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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