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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c625ed020a67af760d04693a067784ff2478053aba63638a67155de1d7c67354' 
  AND token = '3mjNsWgkoMAR0Vs+4Cl0PsLfem86M4yX8BI3wh8RHdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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