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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e076999633b078cb82b8d6a2b94650a8f7645a7e36ae2e948463eb27f5528a57' 
  AND token = '0RiOPDQzEDXIrchIjETwFrYzCtAXk0v28id+ODRuWn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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