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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2291caa2171c2b296baf808dcd552d771641de9267a163acb8a5fe79dc2ee18d' 
  AND token = 'bG3PtzShUOKarofD293ye6lsl92ZAI76rZP83FdT6EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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