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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669b2a4e6373d51a601ef766b0aca42e159fd588e821b440a70134602cd6dd70' 
  AND token = 'G5Dfr+SA66WtbuS2TdPYKtETT4+z2H/HxID9G1s2SCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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