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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295fbb7181b38dccc3f7d5ce48c647ee9325f2dc9c29380a20663566b0afb43e' 
  AND token = 'hPeNkwHz8buDVVaNij9II14MEtqqJY05Px6aQrx72t0=' 
  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"
    }
  }
}