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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5292a6874adf0c97a46a54286f0f362b5700dedbe9b17029d939a98acbf2eadd' 
  AND token = '3aW6ZwcCKqpOhynGppa6eTT0x6qPiQhb+//gM6ui1mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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