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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ae28f37a5099a6c3f7d933f9742ec830776adf9539bb9bb3eb4c3e1944cc26' 
  AND token = 'H5z6AOx+nK8Ym4eYXbWl6+6XgeN29Rh3JN2MVAuXuhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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