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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7949859c327460c708ccca1e8ddf85a73a8103152d359874d420f7d6ed36538f' 
  AND token = 'As0VyPWV0G0TMJoGVRTvWKOrFa5JhK/oqoy1T/BxCx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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