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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e3310613e39e4d4197a5b60eb7cc0dc846725065c28806d118afbf87b60f3c' 
  AND token = 'DiAloaQ4EIJiLwsDQYwFasidAk8xZojYZ6by+f78KB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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