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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf584155d911304f3ffb7e5c80eb8a1f689ac23bc3c1c6d59b50fa5f1389ac3' 
  AND token = 'mBU1dMY4wGPtyhtVDSVDWJingWtwrpI6uoUtTrZYApI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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