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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63920f74678f575c507c2a77a85a92bf724febdea2b58171e13c5e77a8cc771' 
  AND token = '8GDu7U810pkUtvuqhuQjF8mPS+mnB87JHpet5YBzMm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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