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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e207b91b8dc36af5b49a36ae5cebf1ca6530b03d7c794d357623fe2a19d1b2' 
  AND token = 'RfT4pYclx3VKejx+aMbf5dGAYgZDvc+gCJ1XAYf13oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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