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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bedc35fecb80b7e45d9cb8f0b4258fd7ba863f489e7bea5232bef3f94451e8' 
  AND token = 'TwFyh7PR6puACsidnL+4m5LMl3I3r0jf39GvHR4PeI4=' 
  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"
    }
  }
}