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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598533632aecb87c9ca76b954091eb0b35b74aa058ca2fcfbefb1002b4d226ee' 
  AND token = '4vz48Wq2Tg33X8M1N+I1YllPeWLW1H6dDXfMZGqhicY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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