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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478d77b876ae352a6de4969df4a5458c2ce8c5a40aaa41cc8192337c4ff40026' 
  AND token = 'yfto3/WyOxqPeUeSRsPl5r2YRUDwP1FCIA1d+0G8l+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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