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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3926869969980c7cb16e6556b875dfe48b8ef0dfa4fe61c9cb21695e968f54e4' 
  AND token = 'rFCl5DJ5FO0WL4WIXz0YH75zaNnM16zzIDWj10xTK6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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