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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720de185241ee5437fef9808f03f9534ada8aa0e8c1a58acab799f7b5d88e824' 
  AND token = '7fJlJr6S1TpYVP3IAano/VQGHwANtMMdmxOE037HjnI=' 
  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"
    }
  }
}