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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e60f1d2d30c6b70ffd0d841af80a92f6b9901c948794668a7510a323b8376b6' 
  AND token = 't0XQOLl2jErgqaMbUEX/MHPeFFzfxeiSeBFmkm5j5Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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