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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f225d24c5444a11a4bf2e006b739027cfdd862a35027917f27c6a3dea62224' 
  AND token = 'XxD5hRZhLlNAOp7ie2qXrWK6/lxeuMMu6rcR5g6OEIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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