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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa450559672c4a8d553b5936c7a33fdb28777d7c145256ad69702c2a60f5b9e' 
  AND token = 'XnKgGv7XLrdvt8t/eaPzhVcDQBEcraXidWAkdyBrz9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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