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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735f87d7333e42f6b3edb7bff65d517fc1c75ecffc4ceb3c7f0959120185d8e6' 
  AND token = 'cO5K8kdY9ImeO44/nIhYRZWF0zdlbduaPCtPdCxV9Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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