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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e50bdae823b951001a939e38f493b6e1bcd853d0b0d35ba4af5fc96c4e808c' 
  AND token = 'hdhjPvQQTB3itTknCqru32RLEHw6e8cI25WStHUur+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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