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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52421d89c895c2c45590e12d1bd26af1ef2fc3595ace26e3d17109639760a701' 
  AND token = '2uQNzeA2fxK2k+ruJHAilC229qi7jjvClkVuw7JSbss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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