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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4ad512f730381fcae1a3f51ba20043336ff7ef0d0a9b257c20689fe58c7a65' 
  AND token = 't1MeHMbtDf/36lFGJ6nDlqYQN2DXIy3/q6ASLVUYGX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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