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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bed41ee4c59b0d197b8cb3ab2c4810d28e831831d17227e449018f7c95b50b' 
  AND token = 'GQy550LEFxJBiPCD53Usl2jiXrdWHXdVwt/l7Ds8nDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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