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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f6d5d002a46b30fed3bb8fcdeb43be8900fe16dec4d169b63ad7bf5203f95d' 
  AND token = 'qog1kQ7q1ZrWT3vshto7Agmx9u9zTALjNYKEK/QQcks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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