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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e99391c29b9acb77d0b7917a114194b2d76af3c7ea2782a09fabb4516ff4188' 
  AND token = 'fC8YATCu9KcRSKT6JUoLwHplpF2PN8FU97aVdE2NKxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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