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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d891aa69edb53672b93e7fa0fe072fb32f61e7f6a93aaa9d27e1d4b9b2e837' 
  AND token = 'yH6T0hlsi/ai6vxkoc3j99iEZDg00uLxL+QQvbD46v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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